• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.11 no.3
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• pp.229-234
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• 2001

The EDXRF(Energy Dispersive X-ray Fluorescence Spectrometer) technique was applied to the determination of heavy metals in welding fume. The EDXRF method designed in this study was a non-destructive analysis method. Samples were analyzed directly by EDXRF without any pre-treatment such as digestion and dilution. The samples used to evaluate this method were laboratory samples exposed in a chamber connected with a welding fume generator. The samples were first analyzed using a non-destructive EDXRF method. The samples subsequently were analyzed using AAS method to verify accuray of the EDXRF method. The purpose of this study was to evaluate the possibility of the non-destructive analysis of heavy metals in welding fume by EDXRF. The results of this study were as follow: 1.When the samples were collected under the open-face sampling condition, a surface distribution of welding fume particles on sample filters was uniform, which made non-destructive analysis possible. 2. The method was statistically evaluated according to the NIOSH(National Institute for Occupational Safety and Health) and HSE(Health and Safety Executive) method. 3. The overall precision of the EDXRF method Was calculated at 3.45 % for Cr, 2.57 % for Fe and 3.78 % for Mn as relative standard deviation(RSD), respectively. The limits of detection were calculated at $0.46{\mu}g$/sample for Cr, $0.20{\mu}g$/sample for Fe and $1.14{\mu}g$/sample for Mn, respectively. 4. A comparison between the results of Cr, Fe, Mn analyzed by EDXRF and AAS was made in order to assess the accuracy of EDXRF method. The correlation coefficient between the results of EDXRF and AAS was 0.9985 for Cr, 0.9995 for Fe and 0.9982 for Mn, respectively. The overall uncertainty was determined to be ${\pm}12.31%$, 8.64 % and 11.91 % for Cr, Fe and Mn, respectively. In conclusion, this study showed that Cr, Fe, Mn in welding fume were successfully analyzed by the EDXRF without any sample pre-treatment such as digestion and dilution and a good correlation between the results of EDXRF and AAS was obtained. It was thus possible to use the EDXRF technique as an analysis method of working environment samples. The EDXRF method was an efficient method in a non-destructive analysis of heavy metals in welding fume.

• Journal of Korean Philosophical Society
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• v.123
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• pp.409-440
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• 2012

It is well known that Deleuze began his philosophical work from researching the biographies of many predecessors' such as D. Hume, Lucretius, I. Kant, B. Spinoza, F. W. Nietzsche, H. Bergson, and etc. Among them, especially Spinoza, Nietzsche, and Bergson constitute a foundation supporting the whole idea of Deleuze. He declared that the goal of his early biographical work is a theme converging the identity of two philosophers, Spinoza and Nietzsche, and it shows that these two philosophers had such a huge significance to Deleuze, at least by then. However, we may point out two issues here. The first is why Deleuze, who is recognized as a philosopher of 'difference', deals the identity. The other issue is, what kind of identity exists between the two philosophers, Spinoza and Nietzche. In a common sense, their ideas contradict to each other. Spinoza puts God at the center of his philosophical system, whereas Nietzsche declared 'God is dead'. Though Nietzsche expressed a concurrent opinion with Spinoza at first, it is well known that he turned his side against him soon after and criticized him sharply. There is a conflict at the core of this criticism concerning the existence or non-existence of God. Many think that Spinoza, however, cannot be free from the argument that his philosophy allows a possibility of atheism. Deleuze, who also called Spinoza an atheist, suggested a new viewpoint of the philosophy of Spinoza based on his attribution to the concept of 'power'. On the other hand, Deleuze reinterpreted Nietzsche, where he analyzed 'the will to power' in a totally inventive way. Likewise, the reciprocal communication of ideas connected by the concept of 'power' gives a foundation of identifying the two philosophers to Deleuze. In this paper, considering this reciprocal communication, I intent to reveal the foundation of identity of the two philosophers, Spinoza and Nietzsche, and as a result, investigate what the concept of identity means to Deleuze, the philosopher of difference. Furthermore, we will also take a look at how Deleuze presents a new perspective on the conflict on the existence of God of the two philosophers in the process of validating the identity.